Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1976-04-30
1977-10-04
Shapiro, Jacob
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173DIG1, 175 6, E02D 710
Patent
active
040516857
ABSTRACT:
A pile driving apparatus to be lowered onto the head of a previously submerged pile positioned in a caisson is guided in its descent on cables. The cables are secured to a crossbar attached near the head of the pile. The crossbar must be attached sufficiently close to the head of the pile so that the funnel shaped mouth of the pile driving apparatus is guided onto the head of the pile even if the surface ship has drifted laterally to pull the cables away from the vertical, or if the pile itself is positioned in the caisson at an angle to the vertical.
The crossbar is attached to the pile by retractable pins extending through longitudinal slots in the pile, or by extendable pressure pads that engage the circumference of the pile. Means are provided for automatically retracting the pins or pads whenever the crossbar bears against the pile driving apparatus.
REFERENCES:
patent: 26073 (1859-11-01), Whipple
patent: 3434551 (1969-03-01), Rosfelder
patent: 3491842 (1970-01-01), Delacour et al.
patent: 3795114 (1974-03-01), DeCremiers et al.
Hollandsche Beton Groep N.V.
Shapiro Jacob
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